Well-casing puller.



C. O. WALLACE. WELL CASING FULLER. APPLICATION FILED act. 23, 1915.

Pa tnted June 6, 1916 nrncrnn sire to a i r all enemies o. WALLACE, on cassero es, E'FJYQIEIISIG.

went-oestrus PULL-EB.

Specification of Letters Patent.

rate'ateaeaae 1916.

Application filed October 23, 1915. Serial Ho. 57,480.

This invention relates to oil well tools and" more particularly to casing pullers.

In pulling \vell casings, 1t has been. frequently found that \v1th all the power available a casing could not be moved or the cable or wire line broken under the strain, thus leaving the puller down in the well and causing a. dead loss to the operator, also making it impossible to work the well.

it is the object of the invention, therefore, to avoid these difficulties and to pro YlllC a device which increases its gripping capacity with increased power applied to the lifting cable or wire line.

it is a further object of the invention to provide a device of this character which can be readily removed from the casing in case the cable breaks or'there is sutiicient power to lift the casing from the well, thus av0iding loss of the puller.

l urther objects of the invention will appear as the l'ollowing specific description is read in connection with the accompanying drawing which. forms a part of this application. and in Which:

Figure l is a front elevation. Fig. 2 is a side elevation. Fig. 3 is a vertical sectional view on the line of Fig. 2.

As shown in the accompanying drawings, the puller is constructed of a pair of relatively heavy members 1 and 2 each of which is bifurcated at its upper and lower ends and has extending across said bifurcations, the. removable shafts or pins 3 and & upon which the cable rollers 5 and 6 are jourualed.

Secured to the front and back of the member 1 are laterally extending pivot plates 7 through the free end of which and through the member 2 extends the pivoting shaft 8 so as to connect the members together in the manner oi a pair of expanding pliers.

Each member has formed thereon supporting and retaining shoulders 9 and 10 between which is seated a. gripping dog 11 connected to its respective member by a bolt 12 and adjustable toward and away from the member by the insertion of suitable chines it. These members preferably extend the full thickness or Width of the members 1 and 2 and are made of hardened steel so as to withstand wear and" the Work imposed thereon.

The pintles or shafts"3 and 4 are made removable so as to permit of their insertion accompanied by the rollers within the loop 15 formed at the lower end of the lifting cable or Wire line, and the loop 18 formed in the lower end of the releasing cable. This latter loop extends down between the members and between the plates 7 and engages over the rollers 6 so that when pulled upon the lower ends of the members 1 and 2 may be drawn together thus carrying the gripping dogs out of engagement with the casing and permitting the puller to be Withdrawn therefrom. When any lifting power is applied to the Wire line the upper ends of the members 1 and 2 will be drawn together and the lower ends expanded so as to bring the dogs in final engagement with the interior of the Well casing as will be readily understood. Increased lifting power applied to he life ing cable will produce an increased gripping effect.

1. A casing puller comprising a pair of spaced and pivotally'qonnected members having pulleys at their upper and lower ends and easing gripping dogs below their pivotal point, a raising cable having a loop at its end to engage over the upper pulleys and a releasing cable having a loop to enover the lower pulley.

A casing puller comprising a pair of paced pivotally connected members and pull el ments having loope, ends loosely connected with opposite extremities of the said members. i

In testimony whereof I etlix my signature 

